Spine - Spine is 2D animation software designed specifically for software and game development.
Spirit - The animation tool for the web.
Synfig Studio - Just another WordPress site
Marionette Studio - Marionette Studio is an online animation software for beginners and professionals. Animate 2D characters and environments in minutes with no prior skills.
Unity 2D - Unity 2D is a powerful and feature-rich game design solution built from the ground up to fulfill every basic and advanced need of the developer.
Lottie by Airbnb - Easily add high-quality animation to any native app